charging power (far) surpasses PV surplus

[freto036]

I have added the integration to my HA instance and while I have finally managed to get the automation to trigger and start charging, the wallbox is using FAR more power than I have surplus. The values of what I export into the grid are correct, e.g. right now about 1900W, however, the Wallbox in eco mode starts charging and goes to over 4500W (that is after setting the charging speed to 6A. When I had it set to the usual 16A, it went up to 11kW). What am I doing wrong, what part am I missing?

edit: also, is there a way to ensure, that the energy stored in the battery is NOT being used?

Sorry if these questions are dumb, I am new to both, HA and my pv system

[marq24]

typically the root cause is, that one (or multiple) of the values you provide via the service need to be multiplied with -1 (at least best to my knowledge)

[freto036]

That only solved the automation to trigger charging, but not the power used. The value for current power export in HA is the same as the information my inverter provides in its app. That value was multiplied with -1 in order to have negative values for the wallbox. So e.g. -1600W and the wallbox starts charging the car as there is PV surplus.
Now my expectation was, that it would use ONLY the surplus to charge the car. Instead it just switches charging on at whatever charging speed is set in the app, thus surpassing the surplus I am generating. So I have a feeling it is more a setting of the wallbox, rather than data transfer between HA and the wallbox

[marq24]

well - see, this HA integration just can pass data to the Wallbox - and then the Wallbox makes the math/decision - if you are 100% confident, that you provide the data in the appropriate/expected format (and units) [which is typically the most common error case for the beginning], then you must ask your question @ goE as manufacturer - since then you say, that their charging-logic is not working as you expecting it.

Just have in mind, that electric control loops have a trend to fluctuate...

[freto036]

just to make sure that I am not mistaken: pgrid is supposed to be negative in Watt (if surplus is available), ppv is supposed to be positive in Watt and pakku can be either positive or negative in Watt (depending on the battery being charged or discharged).

[freto036]

It was in fact a setting in the app:

apart from switching PV surplus charging on, one should also define the available settings, such as: starting power level (i left that at the default value of 1,40 kW) power preference (which I changed to "prefer power TO grid") and the grid target to "-200 W".
Since I have made these changes, the charge is dynamically adjusting to the available surplus.